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Dyfyniad Arddull ChicagoDavis, David Howard. Comparing Environmental Policies in 16 Countries. Boca Raton, FL: CRC Press, 2014.
Dyfyniad MLADavis, David Howard. Comparing Environmental Policies in 16 Countries. CRC Press, 2014.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.